// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_
#define MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_

#include <SLES/OpenSLES.h>

#include "base/logging.h"
#include "media/base/media_export.h"

namespace media {

template <typename SLType, typename SLDerefType>
class ScopedSLObject {
public:
    ScopedSLObject()
        : obj_(NULL)
    {
    }

    ~ScopedSLObject() { Reset(); }

    SLType* Receive()
    {
        DCHECK(!obj_);
        return &obj_;
    }

    SLDerefType operator->() { return *obj_; }

    SLType Get() const { return obj_; }

    void Reset()
    {
        if (obj_) {
            (*obj_)->Destroy(obj_);
            obj_ = NULL;
        }
    }

private:
    SLType obj_;
};

typedef ScopedSLObject<SLObjectItf, const SLObjectItf_*> ScopedSLObjectItf;

// Guesses the channel mask for a given channel count. Android does not offer a
// way to configure the layout, so this will be incorrect for less common
// channel layouts.
MEDIA_EXPORT SLuint32 ChannelCountToSLESChannelMask(int channel_count);

} // namespace media

#endif // MEDIA_AUDIO_ANDROID_OPENSLES_UTIL_H_
